non detergent oil

No. Use detergent oil no matter how loaded up your engine may be with sludge, there will be no further buildup, and none will disolve nor break loose as the old wives tales predicted.

Change your oil regularly and you'll be fine.
 
I put modern oil in my merc about 6 months ago. Didn't know what was in there from the last owner, except to say it was black as tar and thicker than treacle so could've been many years old. Maybe non-detergent stuff, who knows.

Since then I have drained and replaced the oil 3 times just encase there was something in the old tale. No sludge or scary looking blobs, just slightly black oil as you would expect from an old motor.
 
3rd owner of a 38 standard.The 2nd owner said 30 wt,non detergent,every 1000 miles.Why would I do doubt him ? Does detergent oil ruin your your seals , I think so.
 
ford38v8 said:
No. Use detergent oil no matter how loaded up your engine may be with sludge, there will be no further buildup, and none will disolve nor break loose as the old wives tales predicted.

Change your oil regularly and you'll be fine.
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That is exactly right. I used the crappy non detergent oil based on said wives tales. The oil was crap, I was getting blowby, etc. Finally switched to detergent and the motor is much happier.
 
A lot of people put used oil in their car back in the day --is that a reason to use it now?
I like the diesel oils because it is better suited to a car that doesn't have perfect mixture control ---it is designed to deal with the carbon contamination from less than conplete combustion
 
Non detergent is for cylinder break in only (first 500-miles after overhaul). An engine run for extended periods with non detergent will be a dirty engine with soap deposits all over the inside.
 
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